When does the high level light go out after the operator acknowledges an activated alarm on a Type 4 storage tank?

The high level light on a Type 4 storage tank goes out when fuel is removed to below the high level alarm setting. This is because the high level alarm is designed to alert operators when the fuel reaches a critical level that may lead to overflow or other safety hazards. Once the operator acknowledges the activated alarm, the system continues to monitor the conditions in the tank. The high level light will remain illuminated until the fuel level is reduced below the high level alarm threshold, indicating that the situation is under control and no longer presents a risk of excess fuel volume. This design ensures a clear indication that the fuel level is safe before resetting alarm indicators, reinforcing the importance of maintaining operational safety in storage tank management.